No, nothing will happen if you scam on BTCJam. So set up some shell accounts and scam away 
It's not even worth it to mine anymore when there's an endless supply of idiots on there that'll just fork over their BTC if you promise to return 20%.
It's not even worth it to mine anymore when there's an endless supply of idiots on there that'll just fork over their BTC if you promise to return 20%.